If the heat riser is one the vacuum formed ceramic fiber heat riser described on Brian Kopp's thread, is a ceramic blanket still necessary, or not necessary but still a good thing, or completely useless?
If I'm going to use one I should order it now as I have most everything else.
Those risers are made for pouring molten metals. I don't plan on using a layer of ceramic blanket insulation with it. Neither does Peter nor Matt Walker use one to the best of my knowledge. Any other input is welcome.